package com.example.turingim;

import com.example.turingim.handler.WebSocketHandler;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.*;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.stream.ChunkedWriteHandler;
import io.netty.util.concurrent.GlobalEventExecutor;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public class IMServer {
    public static final Map<String, Channel> USERS = new ConcurrentHashMap<>(1024);

    public static final ChannelGroup GROUP = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);

    public static void start() {
        EventLoopGroup boss = new NioEventLoopGroup();
        EventLoopGroup worker = new NioEventLoopGroup();
        // 当定端口
        ServerBootstrap bootstrap = new ServerBootstrap();
        bootstrap
                .group(boss, worker)
                .channel(NioServerSocketChannel.class)
                .childHandler(
                        new ChannelInitializer<SocketChannel>() {
                            @Override
                            protected void initChannel(SocketChannel socketChannel)
                                    throws Exception {
                                ChannelPipeline pipeline = socketChannel.pipeline();
                                // 添加 http 编码解码器
                                pipeline.addLast(new HttpServerCodec())
                                        // 支持大数据流
                                        .addLast(new ChunkedWriteHandler())
                                        // 对 http 消息做聚合操作，FullHttpRequest、FullHttpResponse
                                        .addLast(new HttpObjectAggregator(1024 * 64))
                                        // websocket
                                        .addLast(new WebSocketServerProtocolHandler("/"))
                                        // 自定义 handler
                                        .addLast(new WebSocketHandler());
                            }
                        });

        ChannelFuture future = bootstrap.bind(8080);
    }
}
